what about this prop

[Shopguy]

Anyone ever run a 15x15 prop? Currently running a 14 5/8"x17. Loaded at 5000rpm. Ran 39 with two teenagers the wife and me. Would like to get the R's up a bit since that was a light load for us that day. 15x15 or 14.5x15?

[Bamaman]

For the F150 Yamaha, the best prop you can get will be the Yamaha Reliance 15 pitch prop.

My boat's pulling 6000 rpm's @ 40 mph with that prop/engine combination, and it's a good compromise in every way.

[keosports]

i am kind of in the same boat as you, i had a 15x17 on my new etec 150 and was getting 40mph @ 5000rpm, just put on a new 15x15, hoping to get over 5500rpm and more speed, hoping to test out saturday.

[Bryden24shp]

Shopguy, let me know what speeds (GPS) you are running at 2000/3500 and WOT, and note the top RPM's. Give me the max RPM's your motor can run and I'll toss the numbers on my Prop program and see what we come up with. By going 15X15, you may not gain much. The added diameter will pull down the slip number and in turn, reduce the RPMs. Now a 15X14 or 13 pitch, may be the answer.
We can work on it for ya....

[keosports]

i tried the new 15x15, got up to 5600 rpms but dropped to 37mph, I am going to try a 14 3/4x16 next

[Bryden24shp]

i tried the new 15x15, got up to 5600 rpms but dropped to 37mph, I am going to try a 14 3/4x16 next

I found my Etec loved Renegades and Vipers, I would try a 15X14 Viper. The lowest pitched Renegade is a 15, is a big eared prop, not much slip, so it probably won't gain much, may loose RPM's. The 16 you want to try will probably drop your RPM's more. Pontoons like alot of cup in props, to reduce slippage.